Win10 build 1703 and Windows Update

Starting with the build 1703, several users report issues with Windows Update and the Windows Store Apps.
I doubt this is related to the Toolkit. The bug seems to occur when an imdisk volume is present, no matter the file system, and even if the TMP environment variables don't point to it. But I am unable to reproduce it.

Of course, this is merely one of the countless bugs of Windows Update, but I wonder if someone knows a way to reproduce it.
Olof, did you get reports on this subject?